Common fertilizers have the oxidizing and the reducing elements on the same molecule; therefore they have an explosiveness nature. Reliable approach for fast recognition of such compounds is an urgent need. Laser induced photoacoustic spectroscopy is an interesting technology as it can offer characteristic thermal, acoustical, and light absorption coefficient. The paper deals with a photoacoustic spectroscopy technique to record the characteristic photoacoustic frequency-response of common explosive-related materials. The proper stimulating light was generated using pulsed Q-switched Nd:YAG laser at 1064 nm. Photoacoustic signature for each investigated material was recorded using high response piezoelectric transducer. The captured signal was processed using novel digital algorithm designed for time and frequency domain analysis to achieve good discrimination between different explosive-related materials. Each investigated material demonstrated a characteristic absorption coefficient as well as frequency response with maximum amplitude at 47.9, 49, and 46 MHz for urea nitrate, ammonium nitrate, and ammonium perchlorate respectively.

普通肥料在同一分子上具有氧化和还原元素。因此，它们具有爆炸性。迫切需要一种可靠的方法来快速识别此类化合物。激光诱导的光声光谱技术是一项有趣的技术，因为它可以提供特征性的热，声和光吸收系数。本文采用光声光谱技术来记录常见爆炸物相关材料的特征性光声频率响应。使用脉冲调Q的Nd：YAG激光在1064 nm处产生适当的刺激光。使用高响应压电换能器记录每种研究材料的光声特征。捕获的信号使用新颖的数字算法进行处理，该算法设计用于时域和频域分析，以实现对不同爆炸物相关材料的良好区分。每种被研究的材料分别显示出硝酸尿素，硝酸铵和高氯酸铵的特征吸收系数以及最大幅度分别为47.9、49和46 MHz的频率响应。